How can packaging and printing industry VOCs control the emission of VOCs?

[China Packaging Network News] China's packaging and printing industry uses a lot of solvent-based inks in the production process, and these solvent-based inks contain 50% -60% of the volatile components, plus the diluent needed to adjust the viscosity of the ink, in A large amount of VOC organic waste gas will be emitted during the production and drying of printed materials.

The source of packaging and printing VOCs

VOCs are derived from inks and thinners used in the printing process, compounding adhesives, and equipment cleaning agents. Possible emission pathways include solvent volatilization during ink formulation, ink solvent evaporation during the printing process, drying stage, compounding process, and equipment cleaning process.

Mainly concentrated in the following two processes:

(1) The emission of organic waste from VOCs of publishing and printing companies is mainly concentrated in the printing and drying stages;

(2) The discharge of organic waste gas from VOCs in flexible packaging printing enterprises is mainly concentrated on two process modules: printing on the machine and adhesive compounding.

Control of Printing and Packaging VOCs

Since the VOCs produced by the printing and packaging industry mainly come from the volatilization during the storage and use of ink solvents, the source control, process control and end-of-pipe management must be used in a comprehensive manner to manage, and the source must be emphasized.

Source control

Promote the use of clean production of environmentally friendly raw materials. Promote the use of water-based inks, single-component solvent inks; Encourage the use of environmentally friendly inks, adhesives, and cleaning agents that are certified by China's environmental labeling products; Encourage the use of UV-curable (UV) inks, use substrate cleaning, and use equipment for low volatility when car washes. And high-boiling detergents (green car wash water or W/O cleaning lotion, etc.) replace gasoline and other solvents, lithography companies use no / low alcohol chemical solvents as a fountain solution (alcohol content of not more than 5%).

Process control

Process control is mainly to regulate the operation of each process, such as the specification of thinners, cleaning agent storage; standardization of raw material deployment, transfer and use; improve the exhaust gas collection device.

End control

The generated VOCs must be equipped with a high-efficiency purification treatment device to ensure compliance with discharge standards. According to the product, operating conditions, air volume, temperature, pollutants characteristic concentration of pollutants and other parameters to choose the economic and applicable processing technology.

VOCs recycling

Through physical methods, at certain temperatures and pressures, techniques such as adsorption, filtration, and condensation are used to separate or recover volatile organic compounds, such as adsorption, condensation, and membrane processing technologies.

VOCs decomposition

Through chemical or biological reactions, under the influence of external factors such as light, heat, catalysts and microbes, the organic matter is converted into water and carbon dioxide to process VOCs. Such as high temperature incineration technology, catalytic combustion technology, low temperature plasma decomposition technology, photocatalysis technology and bio-decomposition technology.

So what kind of technology is more suitable for you? Xiao Bian has found a picture for everyone, comparing its own exhaust gas flow rate and exhaust VOCs concentration can be clearly known.

Emission Standards

Although the national emission standards of the printing industry have not yet been released, key regions and cities have issued real-time plans for VOCs governance in key industries. Here, Xiaoxing will introduce the VOCs emission standards of the printing industry in Beijing, Shanghai and Guangdong.